Hello!
This is Yamanaka from Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior wall painting, and exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of an exterior renovation project in Saitama Prefecture requested by Company S.
There are several types of exterior renovations, but this project involves a roof overlay (cover method) using Galtect!
We implemented measures against leaks due to the roofing work!
On this page, I will explain the actual results of the work done by Kakeru Koumuten!
The existing roofing material was colonial containing asbestos!
Since the disposal cost of replacing (re-roofing) asbestos-containing colonial is high, it is recommended to use the overlay method early before the underlying structure deteriorates!
Thank you very much for choosing Kakeru Koumuten from among many contractors.
Roof Overlay (Cover Method) Construction Procedure
1. Dismantling of Existing Roof Ridge Flashing
We will dismantle the existing roofing materials (ridge cap, snow guards) that are unnecessary for the
2. Roofing Installation (Waterproof Sheet)
We used Nissin Kogyo/Kappa 23 for the roofing!
It is made of modified asphalt roofing material, which is said to have double the durability of regular asphalt roofing.
As a primary waterproofing measure, if the roofing is solid, there will be no leaks!
We will ensure it is firmly adhered to prevent it from blowing away.[/chat]
3. Component Processing (Kera, Curved, Valley)
Before the main roofing work, we will process and install components such as the kera and curved metal!
The components used are genuine Galtect components made of SGL copper plate! [/chat]
4. Main Construction (Aiji Industry/Super Galtect)
After processing the
Once we have installed it up to the ridge, we will set up the necessary materials to secure the ridge board called “kanban.” There are types of kanban made from cedar and resin, and this time we used cedar!
5. Processing of Ridge Metal and Sealing at Various Locations
Next, we will process and install the ridge metal. We will firmly apply sealing on the inside of the joints. For the wall edge, we will process and install a component called “ameosae bankin” (rain guard metal).
We use stainless steel nails and screws that are resistant to rust![/chat]
6. Cleaning
We will clean up the debris that has fallen onto the balcony and rain gutters. We will thoroughly remove items like nails and metal scraps that could lead to injuries. Additionally, we will wipe off any footprints left on the roof to keep it clean.[/chat]
About Roofing Materials
The roofing material used is the Super Galtect from Aijii Industry.
The Super Galtect comes with a manufacturer warranty of 15 years for the coating and 25 years for perforation.
We also provide a 10-year construction warranty!
Made of SGL steel plate, it is resistant to rust.
Insulation material is tightly applied from edge to edge of the roofing material, creating a metal plate that integrates the steel plate and insulation.
When installed, insulation is applied even to the parts where the roofing materials overlap, and the surface is coated with high heat-reflective paint, allowing for a cool summer and a warm winter.
Additionally, it has soundproofing properties, reducing the sound of rain.
Moreover, it is lightweight compared to other roofing materials, which minimizes shaking during earthquakes, making it a good earthquake countermeasure.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and our construction records show that the Super Galtect from Aijii Industry is the most popular choice, receiving considerable attention!
Colors
■ Shade Black
■ Shade Brown
■ Shade Blue
■ Shade Moss Green
■ Shade Charcoal
You can choose from these 5 colors!
This time, the cover work was finished very well with Shade Black!
The customer was very satisfied, and I was also very happy!
Thank you very much!
Please take a look at other roofing work examples from here!
What is the roof overlay (cover method)?
The roof overlay method involves leaving the current roof almost intact and placing a new roof on top of it, effectively covering it.
Literally, it is a method of covering a roof with another roof. Therefore, the roof becomes double-layered. Since the roof is laid over, it is also referred to as “overlapping roofing.”
Benefits of the overlay method
Since a “new roof” is placed over the “current roof,” dismantling work is almost unnecessary, meaning that very little waste is generated.
This is the biggest feature and leads to various benefits.
The only parts that require dismantling and waste disposal are the ridge cap, making it more cost-effective compared to complete roof replacement.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for details, please refer to the Ministry of Health, Labour and Welfare’s website).
Building materials used in constructions completed before 2004 may contain asbestos. Asbestos-containing materials are difficult to dismantle due to their high environmental impact, and the costs for dismantling and waste disposal are also high. The overlay method, which generates almost no waste, is ideal for such roofs.
Some may wonder if it’s safe to live in buildings that use asbestos-containing materials, but rest assured. As long as there is no destruction or crushing, it will not disperse into the air.
If you are unsure about the type of roof on your home, please consult us.
Additionally, the construction can be completed in a shorter time frame compared to painting or complete replacement. A shorter construction period means lower labor costs, which in turn makes the costs more affordable.
The psychological anxiety of having to live in an unusual environment is also reduced.
If scaffolding is set up, there may be inconveniences such as difficulty entering and exiting or opening windows. Being able to return to normal life in a short period is a significant advantage.
Our company specializes in roofing work, but the roof overlay method is the most frequently performed work we undertake. We are very grateful that we are continuously able to carry out roof overlay projects without interruption.
| Roof Material |
|
|---|---|
| Manufacturer Warranty | Coating 15 years, Red rust 20 years, Puncture 25 years |
| Expected Durability | About 40 years |
| Color Used This Time |
Shade Black
|
Estimates and inspections are, of course, free! If you have any concerns regarding roofs, rain gutters, exterior walls, or exteriors, please consult Kakeru Koumuten Co., Ltd.!
We carry out everything from temporary scaffolding work to roof construction and exterior painting completely in-house. We are confident that our costs, quality, and efficiency in exterior work are unmatched compared to other companies!
We welcome competitive estimates with confidence!
You will be glad you chose us! We take every request seriously to ensure your satisfaction.
We also have information on roofing costs and pricing plans for the roof overlay (cover method), so please take a look if you’re interested!
We look forward to your inquiries. Thank you very much.
Helpful information about exterior renovations can be found here!
・The Necessity and Timing of Exterior Wall Painting…
・For Residents of Kanagawa and Tokyo｜A Must-See for Those Who Want to Try DIY Exterior Wall and Roof Painting! Scaffold Installation Only! Roof and Wall Painting DIY Plan!
・Introducing Roof Materials That Cannot Be Painted or Recommended!
・What Are the Average Costs for Roof Remodeling? Types of Work and How to Choose a Contractor
・We Will Introduce Current Roof Materials and Remodeling Methods!
・Roof Remodeling | What is Roofing? An introduction to the important roofing material, roofing sheets!
・What are the market prices for rain gutter repairs and cleaning? Tips on timing, fire insurance, and choosing a contractor!
・Renovation store in Yokohama, Kanagawa Prefecture | What is roof overlay (roof cover method)?
Consultations via LINE are also very welcome◎
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AAA is a young company with an average age in the early 20s, but our technology is second to none.
One of our greatest strengths is that we can do all of our own scaffolding, roofing, and painting work. In this industry, where work is generally divided, we are able to provide a complete set of services, which saves time and effort in management and reduces costs. Above all, if there is any trouble, we will come to you right away!
We can confidently declare this. We are the youngest and most friendly renovator in Kanagawa!
